This is a full-day tutorial in writing iOS apps in the new language Swift using the Xcode IDE on Macintosh. An iPhone or iPad app is made of intercommunicating objects belonging to Apple's Cocoa Touch frameworks.   Learn to create and destroy these objects, connect them together, and call their methods. Use them to draw text and graphics on the screen, perform simple animations, display controls such as buttons and sliders, respond to a keystroke or other touch, and recognize a gesture such as a swipe, tap, or pinch.   We concentrate on three iOS design patterns.   1. An object can call a method of its delegate object in response to a changing situation, e.g., upon reaching the end of an audio file during a playback.   2. A control object (e.g., a button or slider) can call a method of its target object in response to a touch.   3. A view controller object can create and call the methods of the view object underneath it, and forms the connection between the view object and the rest of the app.   Tutorial level: intermediate. Prerequisites: Requires previous programming experience, but not necessarily in the language Swift. The examples will be displayed and run on a Mac during the tutorial, and registrants can bring their own Macs if they'd like to run the examples for themselves. Swift requires at least Xcode 6, which in turn requires at least OS X 10.9.3.